CA2143874A1 - Method and Apparatus for Enabling Trial Period Use of Software Products: Method and Apparatus for Utilizing a Decryption Stub - Google Patents

Method and Apparatus for Enabling Trial Period Use of Software Products: Method and Apparatus for Utilizing a Decryption Stub

Info

Publication number
CA2143874A1
CA2143874A1 CA2143874A CA2143874A CA2143874A1 CA 2143874 A1 CA2143874 A1 CA 2143874A1 CA 2143874 A CA2143874 A CA 2143874A CA 2143874 A CA2143874 A CA 2143874A CA 2143874 A1 CA2143874 A1 CA 2143874A1
Authority
CA
Canada
Prior art keywords
file
stub
data processing
decryption
computer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2143874A
Other languages
French (fr)
Other versions
CA2143874C (en
Inventor
Thomas Edward Cooper
Robert Franklin Pryor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Activision Publishing Inc
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of CA2143874A1 publication Critical patent/CA2143874A1/en
Application granted granted Critical
Publication of CA2143874C publication Critical patent/CA2143874C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
    • G06F21/12—Protecting executable software
    • G06F21/121—Restricting unauthorised execution of programs
    • G06F21/125—Restricting unauthorised execution of programs by manipulating the program code, e.g. source code, compiled code, interpreted code, machine code
    • G06F21/126—Interacting with the operating system
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
    • G06F21/106—Enforcing content protection by specific content processing
    • G06F21/1063—Personalisation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
    • G06F21/12—Protecting executable software
    • G06F21/121—Restricting unauthorised execution of programs
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
    • G06F2211/007—Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress

Abstract

A method and apparatus is provided in a data processing system for securing access to particular files which are stored in a computer-accessible memory media. A file management program is provided as an operating system component of the data processing system. At least one encrypted file and at least one unencrypted file are stored in the computer-accessible memory media. An unencrypted security stub is associated with each of the encrypted files. The security stub is at least partially composed of executable code.
The file management program is utilized to monitor data processing calls for a called file stored in the computer-accessible memory media. The file management program determines what the called file has an associated unencrypted security stub. The called file is processed in a particular manner dependent upon whether or not the called file has an associated unencrypted security stub.
CA002143874A 1994-04-25 1995-03-01 Method and apparatus for enabling trial period use of software products: method and apparatus for utilizing a decryption stub Expired - Fee Related CA2143874C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23503394A 1994-04-25 1994-04-25
US235,033 1994-04-25

Publications (2)

Publication Number Publication Date
CA2143874A1 true CA2143874A1 (en) 1995-10-26
CA2143874C CA2143874C (en) 2000-06-20

Family

ID=22883794

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002143874A Expired - Fee Related CA2143874C (en) 1994-04-25 1995-03-01 Method and apparatus for enabling trial period use of software products: method and apparatus for utilizing a decryption stub

Country Status (6)

Country Link
US (1) US5737416A (en)
EP (1) EP0679978B1 (en)
JP (1) JP3503774B2 (en)
KR (1) KR100200445B1 (en)
CA (1) CA2143874C (en)
DE (1) DE69529782D1 (en)

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US5737416A (en) 1998-04-07
JP3503774B2 (en) 2004-03-08
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